Weeds ›

Bahiagrass

Description

Bahiagrass is a warm-season species that spreads by rhizomes, and is easily recognized by its characteristic "Y-shaped" seedhead. It exhibits low overall quality because of its light color, coarse texture, and open canopy. Due to its rapid lateral spread via aggressive rhizome production it is primarily used in areas where erosion control and immediate ground cover are the main concern. It is frequently planted on roadsides and highway rights of way because it has good drought tolerance. In addition, bahiagrass has the ability to tolerate a wide range of soils. Unfortunately, it can be a very competitive and unsightly weed in highly maintained turf.

Cultural Control

Bahiagrass is well suited for roadsides because of its good drought tolerance and general competitive ability in the southern United States. Unfortunately, it can be very competitive and unsightly in highly maintained turf. As with other perennial paspalums, bahiagrass can be difficult to control. Every effort should be made to prevent these weedy grasses from becoming established in turf, as selective control measures are usually difficult. Maintaining a dense, healthy turf year round by proper mowing and fertilization helps prevent encroachment and weed establishment.

Chemical Control

Herbicide and Formulation
Amount of Formulation per 1,000 sq ft
Amount of Formulation per Acre
Pounds Active Ingredient per Acre

Postemergence Control

Herbicide and Formulation

thiencarbazone-methyl + iodosulfuron + dicamba, MOA 14 + 2 + 4 (Celsius WG) 68 WG

Amount of Formulation per 1,000 sq ft

0.057 to 0.113 oz

Amount of Formulation per Acre

2.5 to 4.9 oz

Pounds Active Ingredient per Acre

0.106 to 0.208

Precaution and Remarks

For use by licensed applicators in residential and commercial lawns, golf courses (excluding greens), sports fields, parks, recreational areas, roadsides, school grounds, and sod farms. Provides up to 60 days residual control. Use on bermudagrass, zoysiagrass, centipedegrass, and St Augustinegrass. Apply maximum 7.4 ounces per acre per season. Safe to use at high temperatures. Ryegrass can be overseeded 2 weeks after application. Apply 30 days prior to seeding bermudagrass or zoysiagrass. Wait 2 weeks after bermudagrass seedlling emergence or sprigging operation before applying. For zoysiagrass, wait 3 weeks after seedling emergence before applying. A nonionic surfactant or methylated seed oil at 0.25% v/v is required for optimum control.

Postemergence Control

Herbicide and Formulation

MSMA, MOA 17 (various brands)

Amount of Formulation per 1,000 sq ft

Amount of Formulation per Acre

several concentrations

Pounds Active Ingredient per Acre

1.82 to 4.5

Precaution and Remarks

Bermudagrass, bluegrass and zoysiagrass are tolerant. Injury may result on bentgrass, fescue and St. Augustinegrass (commercial sod production only). Do not use on carpetgrass or centipedegrass. MSMA restrictions: For existing golf courses, spot treat (100 square feet per spot) not to exceed 25% of total acreage. For new courses, make 1 broadcast application per year. For sod farms, make 1 to 2 broadcast applications per year and maintain 25 feet buffer around permanent water bodies. For highway rights of way, make 2 broadcast applications and maintain 100 feet buffer around permanent water bodies.

Postemergence Control

Herbicide and Formulation

imazapic, MOA 2 (Plateau DG) 70 DG

Amount of Formulation per 1,000 sq ft

0.032 to 0.066 oz

Amount of Formulation per Acre

1.43 to 2.86 oz (1 to 2 water soluble packs)

Pounds Active Ingredient per Acre

0.063 to 0.125

Precaution and Remarks

For use on centipedegrass only when grown as fine turf in nonresidential areas such as commercial and industrial turf, golf courses, and other recreational areas. Not for use in home lawns. Do not use on other turfgrass species. See label for mixing instructions of water soluble packs. A repeat application may be needed on tough to control perennial weeds such as bahiagrass. The highest labeled rate may discolor centipedegrass by causing a red color.

Postemergence Control

Herbicide and Formulation

metsulfuron, MOA 2 (Blade, Manor, or MSM Turf) 60 WDG

Amount of Formulation per 1,000 sq ft

0.003 to 0.02 oz

Amount of Formulation per Acre

0.125 to 1 oz

Pounds Active Ingredient per Acre

0.005 to 0.038

Precaution and Remarks

May be applied to established bermudagrass, zoysiagrass (Meyer or Emerald), St. Augustinegrass, Kentucky bluegrass or fine fescue. Do not apply to turf less than 1 year old. Do not exceed 0.5 ounces per acre on centipedegrass, fine fescue, or Kentucky bluegrass. See label for a complete list of weeds controlled. The addition of 0.25% nonionic surfactant will enhance control. May be used for removal of perennial ryegrass from overseeded warm-season turf species. For bahiagrass control, use 0.25 to 0.75 ounces per acre after spring greenup but before seedhead development. A repeat treatment may be necessary in 4 to 6 weeks.

Postemergence Control

Herbicide and Formulation

(Patriot) 60 WDG

Amount of Formulation per 1,000 sq ft

0.007 to 0.046 oz

Amount of Formulation per Acre

0.33 to 2 oz

Pounds Active Ingredient per Acre

0.012 to 0.075

Precaution and Remarks

Apply to unimproved industrial turf only. Use maximum of 0.5 ounces per acre for fescue and bluegrass and 2 ounces per acre for bermudagrass.

Postemergence Control

Herbicide and Formulation

metsulfuron + rimsulfuron, MOA 2 + 2 (Negate 37 WG) 37 WG

Amount of Formulation per 1,000 sq ft

0.0344352 oz

Amount of Formulation per Acre

1.5 oz

Pounds Active Ingredient per Acre

0.0346875

Precaution and Remarks

See comments under postemergence annual bluegrass control. For bahiagrass control, a repeat treatment may be necessary 4 to 6 weeks after initial application.

Presentations

Publications

Species Data

Seedhead/Flower

raceme; V-shaped seedhead

seedheady
seedheady
seedheady
seedheady2
seedheady2
seedheady2
Vernation type

leaves rolled in the bud, may appear to be folded

crown
crown
crown
dscn0850
dscn0850
dscn0850
dscn0874
dscn0874
dscn0874
hairyleafbase
hairyleafbase
hairyleafbase
vernation
vernation
vernation
Ligule Type

membranous; dense white hairs on back, 0.04 inches (1 mm) long

dscn0887
dscn0887
dscn0887
Growth Season/Life Cycle

warm season turf or perennial weed

Auricle type

absent

Leaf blade tip shape

sharp-pointed; usually sparsely hairy along edge toward base, smooth on both surfaces

Leaf blade width

leaf blade mostly greater than 0.2 inches wide, 0.16 - 0.31 inches (4 - 8 mm)

hairyleafbase3
hairyleafbase3
hairyleafbase3
Stolon Presence

absent; due to the open canopy and lack of thatch production, its stout, aggressive rhizomes can sometimes be interpreted as stolons because they appear to grow at or above the soil surface

bhstolon2
bhstolon2
bhstolon2
bhstolon7
bhstolon7
bhstolon7
bhstolon9
bhstolon9
bhstolon9
crown
crown
crown
Rhizome Presence

present; stout

bhstolon2
bhstolon2
bhstolon2
bhstolon4
bhstolon4
bhstolon4
bhstolon7
bhstolon7
bhstolon7
bhstolon9
bhstolon9
bhstolon9
crown
crown
crown
rhizome3
rhizome3
rhizome3
rhizome4
rhizome4
rhizome4
Collar Type

continuous; collar and its edge with hairs

dscn0875
dscn0875
dscn0875
dscn0882
dscn0882
dscn0882
hairyleafbase
hairyleafbase
hairyleafbase
sheath
sheath
sheath
Sheath Margin

open

sheath
sheath
sheath
Sheath Type

flattened; sheath usually not hairy; sharply creased, rather glossy

hairyleafbase3
hairyleafbase3
hairyleafbase3
sheath
sheath
sheath